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The American Petroleum Institute - Service Classification System, is used to classify the oil for a product in a manufacturing year and indicates the oils performance in the areas of oxidization, sludging, foaming, temperature range etc. Classification S is for gasoline engines, C is for diesel. As the years roll on and oil quality and specification improves, so the second letter of the classification changes alphabetically. SE is a now obsolete, the latest itieration is SM. SE through to SM oils can be used in an SE classified engine, SE through to SL oils cannot be used in a SM classified engine. The reason that earlier specification oils appear against later bought equipment specs is mostly pure laziness on the part of cut-and-paste tech authors.

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17y ago

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